diff --git a/lemon/arg_parser.h b/lemon/arg_parser.h
--- a/lemon/arg_parser.h
+++ b/lemon/arg_parser.h
@@ -2,7 +2,7 @@
  *
  * This file is a part of LEMON, a generic C++ optimization library.
  *
- * Copyright (C) 2003-2009
+ * Copyright (C) 2003-2010
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
  * (Egervary Research Group on Combinatorial Optimization, EGRES).
  *
@@ -34,6 +34,44 @@
 
 namespace lemon {
 
+  ///Exception used by ArgParser
+  class ArgParserException : public Exception {
+  public:
+    enum Reason {
+      HELP,         /// <tt>--help</tt> option was given
+      UNKNOWN_OPT,  /// Unknown option was given
+      INVALID_OPT   /// Invalid combination of options
+    };
+
+  private:
+    Reason _reason;
+
+  public:
+    ///Constructor
+    ArgParserException(Reason r) throw() : _reason(r) {}
+    ///Virtual destructor
+    virtual ~ArgParserException() throw() {}
+    ///A short description of the exception
+    virtual const char* what() const throw() {
+      switch(_reason)
+        {
+        case HELP:
+          return "lemon::ArgParseException: ask for help";
+          break;
+        case UNKNOWN_OPT:
+          return "lemon::ArgParseException: unknown option";
+          break;
+        case INVALID_OPT:
+          return "lemon::ArgParseException: invalid combination of options";
+          break;
+        }
+      return "";
+    }
+    ///Return the reason for the failure
+    Reason reason() const {return _reason; }
+  };
+
+
   ///Command line arguments parser
 
   ///\ingroup misc
@@ -116,6 +154,10 @@
                     const std::string &help,
                     void (*func)(void *),void *data);
 
+    bool _exit_on_problems;
+
+    void _terminate(ArgParserException::Reason reason) const;
+
   public:
 
     ///Constructor
@@ -380,6 +422,11 @@
     ///not starting with a '-' character.
     const std::vector<std::string> &files() const { return _file_args; }
 
+    ///Throw instead of exit in case of problems
+    void throwOnProblems()
+    {
+      _exit_on_problems=false;
+    }
   };
 }